Multi objective optimization of the MED-TVC system with exergetic and heat transfer analysis


Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, P.O. Box 16765-1719, Tehran, Iran


The mathematical model to predict the performance and the exergetic efficiency in a multi-effect desalination system with thermal vapor compression (MED-TVC system) has been presented. The energy and the concentration conservation law were developed for each effect, considering the boiling point elevation and the various thermodynamic losses by developing the mathematical models. These analyses led to the determination of the thermodynamic properties at different points and to the gain output ratio (GOR) values. Then, a heat transfer equation was developed in each effect and the required heat transfer areas were determined. Finally, irreversibility analysis was performed, from which the exergy destruction (considering chemical and physical exergy) and the exergetic efficiency were calculated. To obtain the optimum point of a system, multi-objective optimization was used. Determination of the best trade-off between GOR and heat transfer area was the final goal of this optimization. The optimum design led to a selected system with the lowest heat transfer area (and related cost) and the highest GOR.


[1] Ameri M., Seif Mohammadi S., Hosseini M., Seifi M., Effect of Design Parameters on Multi Effect Desalination System Specifications, Desalination (2009) 245: 266-283.
[2] Sayyaadi H., Saffari A., Mahmoodian A. Various Approaches in Optimization of Multi Effect Distillation Systems Using a Hybrid Meta-Heuristic Optimization Tool, Desalination (2010) 254: 138-148.
[3] Shakouri M., Ghadamian H., Sheiholeslami R., Optimal Model for Multi Effect Desalination System Integrated with Gas Turbine, Desalination (2010) 260: 254-263.
[4] Luo C., Zhang N., Loir N., Lin H., Proposal and Analysis of a Dual Purpose System Integrating a Chemically Recuperated Gas Turbine Cycle with Thermal Seawater Desalination, Energy (2011) 36: 3791-3803.
[5] Zhao D., Xue J., Li S., Sun H., Zhang Q., Theoretical Analysis of Thermal and Economical Aspects of Multi Effect Distillation Desalination  dealing with High Salinity Wastewater, Desalination  (2011) 273: 292-298.
[6] Kouhikamali R., Sanaei M., Mehdizadeh M., Process Investigation of Different Locations of Thermo Compressor suction in MED-TVC Plants, Desalination (2011) 280: 134-138.
[7] Shakib S. E., Amidpour M., Aghanajafi C., Simulation and Optimization of Multi Effect Desalination Coupled to a Gas turbine Plant with HRSG Consideration, Desalination (2012) 285: 366-376.
[8] Maraver D., Uche J., Royo J., Assessment of High Temperature Organic Rankine Cycle Engine for polygeneration with MED Desalination, A preliminary approach, Energy Conversion and Management (2012) 53: 108-117.
[9] Al-Mutaz I. S., Wazeer I., Current Status and Future Directions of MED-TVC Desalination Technology, Desalin, Water Treatment (2014) 55: 1-9.
[10] Kashi A., Investigation of Energy Efficiency and Produced Water in Desalination Distillation Systems, International Water Technology Journal (2015) 5: 1-19.
[11] Ettouney H.M., El-Dessouky H. Fundamentals of Salt Water Desalination, Kuwait University (2002).
[12] Sharqawy M.H., Lienhard V J.H., Zubair S.M., On Exergy Calculations of Seawater with Applications in Desalination Systems,  International Journal of Thermal Sciences (2011) 50: 187-196.
[13] Ashour M.M., Steady State Analysis of the Tripoli West LT-HT-MED Plant, Desalination (2002) 152: 191-194 .
[14] Al-Mutaz I.S., Wazeer I., Development of a Steady-State Mathematical Model for MEE-TVC Desalination Plants, Desalination (2014) 351: 9-18.
[15] MAPNA Group, Qeshm Water and Power Cogeneration Plant Data, Iran (2011).